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Environmental Ship Index

The Environmental Ship Index (ESI) measures a ship’s emissions based on the amount of nitrogen oxide (NOx), sulphur oxide (SOx), particulate matter (PM) and greenhouse gas it releases. ESI is used as a good indication of the environmental performance of ocean going vessels or ships.

Ports plan to reward ships when they comply or meet lower than current International Maritime Organization emission standards. Although this is a completely voluntary
program, ports hope the incentives motivate the global port community to assume its role in improving the environment seriously.